package com.example.fuluchou.service.activitystatus.impl;

import com.example.fuluchou.common.errorcode.ServiceErrorCodeConstants;
import com.example.fuluchou.common.exception.ServiceException;
import com.example.fuluchou.service.ActivityService;
import com.example.fuluchou.service.activitystatus.ActivityStatusManager;
import com.example.fuluchou.service.activitystatus.operator.AbstractActivityOperator;
import com.example.fuluchou.service.dto.ConvertActivityStatusDTO;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

@Component
public class ActivityStatusManagerImpl implements ActivityStatusManager {

    private static final Logger logger = LoggerFactory.getLogger(ActivityStatusManagerImpl.class);

    //自动将各个模块写入
    @Autowired
    private final Map<String, AbstractActivityOperator> operatorMap = new HashMap<>();

    @Autowired
    private ActivityService activityService;
    @Override
    @Transactional(rollbackFor = Exception.class)
    public void handlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {

        if(CollectionUtils.isEmpty(operatorMap)){
            logger.warn("operatorMap 为空!");
            return;
        }

        Map<String, AbstractActivityOperator> curMap = new HashMap<>(operatorMap);
        Boolean update = false;
        //先处理：人员、奖品
        update = processConvertStatus(convertActivityStatusDTO,curMap,1);

        //后处理：活动
        update = processConvertStatus(convertActivityStatusDTO, curMap, 2) || update;


        //更新缓存
        if(update){
            activityService.cacheActivity(convertActivityStatusDTO.getActicityId());
        }
    }

    @Override
    public void rollbackHandlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        //operatorMap：活动、奖品、人员
        //活动一定会回滚，奖品回滚后奖品未全部发放
        for(AbstractActivityOperator operator:operatorMap.values()){
            operator.convert(convertActivityStatusDTO);
        }

        //缓存更新
        activityService.cacheActivity(convertActivityStatusDTO.getActicityId());
    }

    /**
     * 扭转状态
     * @param convertActivityStatusDTO
     * @param curMap
     * @param sequence
     * @return
     */
    private Boolean processConvertStatus(ConvertActivityStatusDTO convertActivityStatusDTO,
                                         Map<String, AbstractActivityOperator> curMap,
                                         int sequence) {
        Boolean update = false;
        //遍历curMap
        Iterator<Map.Entry<String, AbstractActivityOperator>> iterator = curMap.entrySet().iterator();
        while (iterator.hasNext()){
            AbstractActivityOperator operator = iterator.next().getValue();
            //Operator是否需要转换
            if(operator.sequence() != sequence
                    || !operator.needConvert(convertActivityStatusDTO)){
                continue;
            }

            //需要：转换
            if(!operator.convert(convertActivityStatusDTO)){
                logger.error("状态转换失败:{}!",operator.getClass().getName());
                throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_STATUS_CONVERT_ERROR);
            }

            //curMap 删除 当前 Operator
            iterator.remove();
            update = true;
        }

        //返回
        return update;
    }
}
